Mount Prospect, Illinois 7 Day Weather Forecast

Wx Forecast - Wx Discussion - Wx Aviation

487
FXUS63 KLOT 230542
AFDLOT

Area Forecast Discussion
National Weather Service Chicago/Romeoville, IL
1242 AM CDT Tue Jun 23 2026

.KEY MESSAGES...

- Dangerous swimming conditions at Lake Michigan beaches through
  tonight.

- Chance of thunderstorms returns Wednesday with periodic, but
  low chances for the end of the week into the weekend.

- Warmer and more humid conditions expected early next week.

&&

.DISCUSSION...
Issued at 132 PM CDT Mon Jun 22 2026

Northeast winds will gust into the 25 mph range through sunset
this evening over land and remain gusty into tonight over Lake
Michigan, allowing for high waves and dangerous swimming
conditions at Lake Michigan beaches. There may be a short period
late this afternoon when speeds/gusts increase a bit, before
then slowly diminishing into this evening.

There will be a low chance for an isolated shower or sprinkles
across northwest IL late this afternoon into this evening and
also across northwest IN, also late this afternoon. Have slight
chance pops but most of the area will stay dry.

An upper trough/closed low and associated weak surface low will
move across the Great Lakes region Wednesday into Thursday. This
will bring the next chance of showers and scattered
thunderstorms to the local area on Wednesday. Still some timing
differences for how soon this activity may reach the cwa, with
some of the models bringing precip into the northern cwa around
daybreak Wednesday morning. Additional development is possible
as a cold front moves across the area on Wednesday though low
confidence for coverage/timing. This front is then expected to
move to central IL/central IN by Thursday morning as another
wave moves east, possibly bringing showers and thunderstorms
along the general vicinity of the frontal boundary. Models then
show another wave for Thursday night into Friday, in the same
general area. While there are periodic thunderstorm chances for
the end of the week, there will also be many dry hours,
especially for areas north of I-80.

Additional precip chances Friday into Saturday will signal a
pattern change to warmer and more humid conditions as an upper
ridge builds northeast into the Great Lakes region. As trends
appear now, the best chance for thunderstorms may be in the
Saturday evening through Sunday afternoon time period as the
ridge builds northeast. Once it does, high temps by early next
week look to reach the upper 80s/lower 90s along with dewpoints
in the lower/mid 70s. cms

&&

.AVIATION /06Z TAFS THROUGH 12Z WEDNESDAY/...
Issued at 1241 AM CDT Tue Jun 23 2026

There are no significant aviation forecast concerns for the
current TAF period.

The presence of surface high pressure in the region will result
in light winds throughout the TAF period, with the strongest
winds near 10 kts expected from a northeasterly to easterly
direction this afternoon at the Chicago metro terminals behind
a sharpening lake breeze. VFR conditions will also prevail
through the TAF period.

Ogorek

&&

.LOT WATCHES/WARNINGS/ADVISORIES...
IL...Beach Hazards Statement until 4 AM CDT early this morning for
     ILZ006-ILZ103-ILZ104.

IN...Beach Hazards Statement until 4 AM CDT early this morning for
     INZ001-INZ002.

LM...Small Craft Advisory until 1 AM CDT early this morning for the
     IL nearshore waters.

     Small Craft Advisory until 4 AM CDT early this morning for the
     IN nearshore waters.

&&

$$

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